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Here is a description of the function, characteristics and standards of a trials mountain bike derailleur:

Function :

The derailleur on a trials mountain bike performs a somewhat different function than that on a conventional mountain bike. Rather than allowing the rider to change gears smoothly, the derailleur on a trials mountain bike is often used as a chain tensioner to maintain constant tension on the chain during maneuvers and jumps.

Features :

1. Chain tension:

The main characteristic of a trials mountain bike derailleur is its ability to maintain high tension on the chain. This allows the rider to perform precise and smooth movements without the risk of chain derailment.

2. Robustness:

As with any trials mountain bike component, the derailleur must be extremely robust to withstand the high stresses imposed by jumps, hard landings and technical maneuvers.

3. Compactness:

Trial mountain bike derailleurs are often more compact than those of traditional mountain bikes, which reduces the risk of getting caught on obstacles and facilitates tight maneuvers.

4. Fine adjustment:

The ability to make fine adjustments to chain tension is essential to allow riders to customize their setup to suit their riding style and course requirements.

Standards:

Trial MTB derailleurs generally follow the same standards as conventional MTB derailleurs in terms of mounting interfaces, chain compatibility and adjustments. However, due to the unique nature of the discipline, some manufacturers offer derailleurs specifically designed to meet the needs of trials riders.

In summary, a trials mountain bike derailleur must offer high chain tension, exceptional robustness and maximum compactness to allow riders to perform technical maneuvers with precision and confidence.